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Arenaceous Foraminifera from Ordovician and Silurian limestones of Oklahoma

, : Arenaceous Foraminifera from Ordovician and Silurian limestones of Oklahoma. Jour Paleontol 4(1): 42-59

Unquestionable spp. of Foraminifera from pre-Carboniferous strata are rare, this lack being ascribed to the fragility of the test which would not permit them to be extracted from consolidated sediments. This group of 13 genera and 30 spp. had the original calcareous cement replaced by silica, thus allowing their removal from the enclosing limestone by dissolving in HC1. Several hundred perfectly preserved specimens were obtained. Unless otherwise stated, the spp. descr. are from the Chimney Hill limestone (Silurian). Astrorhizidae: Crithionina rara* (p.45), first fossil representative of the genus. Rhizamminidae: Bathysiphon curvus* (p.45), genus previously not known earlier than Cretaceous; B. deminutionis* (p.46); B. exiguus* (p.46) ; Viola limestone (Up. Ordovician). STEGNAMMINIDAE (p.48), erected to include Psammosphaerinae (transferred from Saccamminidae) in which subfam. are described Psammosphaera cava* (p.48) (genus previously not known earlier than Jurassic) and Sorosphaera tricella* (p.49) (first fossil representative of the genus) and also subfam. STEGNAMMININAE (p.49) erected for STEGNAMMINA (p.49), type S. cylindrica* (p.49), including S. triangularis* (p.49), and S. hebesta* (p.50), as well as RAIBOSAMMINA (p.50), type R. mica* (p.50) and including R. aspera* (p.50), both Viola limestone. Saccamminidae: Lagenammina sphaerica* (p.51), first fossil representative of the genus. L. stilla (p.51); Thurarnmina, taxonomic note; T. papillata H. B. Brady, first representative of the genus earlier than Carboniferotis; T. tubulata*, T. subsphaerica*, and T. irregularis* (p.52) ; T. triangularis*, T. phasela*, T. elliptica*, and T. arcuata* (p.54) ; Tholosina convexa* (p.55), Viola limestone, and T. elongata* (p.55), first record of the genus as fossil; COLONAMMINA (p.55) (Webbinel-linae), type C. verruca* (p.56); C. conea* (p.56). Hyperamminidae: Hyperammina minuta* (p.56), Ar-buckle limestone (Lr. Ordovician). Ammodiscidae: Ammodiscus incertus* (d'Orb.) ; A. exsertus* Cushman; A.? furca* (p.59) ; Lituotuba exserta* (p.59), previously not known from pre-Carboniferous strata.


DOI: 10.2307/1297861

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